Guess what is Salman Khan's gift to fans on his 50th birthday!

Salman Khan with two blockbusters in 2015 - Bajrangi Bhaijaan and Prem Ratan Dhan Payo - is leaving no stone unturned to ensure his 2016 Eid release Sultan will be the biggest yet.

According to sources close to the project, Salman is personally supervising every department of the film along with director Ali Abbas Zafar and producer Aditya Chopra.

Apparently, Salman sits on the film's story session for three hours every day. All because he sees Sultan as his gift to his fans on his 50th birthday.

Related read: Salman Khan to begin shoot for 'Sultan' minus the leading lady!​

Says a source in the know, "Salman turns 50 in December. Sultan is being built as his 50th birthday project. The star is going into the kind of physical preparation he has never undertaken for any role. Not only that, Salman is also working on polishing the script. He spends three hours each day on the script with the director." According to the source, Sultan which starts shooting in December would be shot at one stretch without distractions.

"In 2015 Salman shot two films Bajrangi Bhaijaan and Prem Ratan Dhan Payo simultaneously. But Sultan will be shot without any break. Salman wants to make sure that at 50, his fans feel he is doing his best work," says the source.